Tammy Blanchard has booked a three-episode arc on the Showtime dark comedy series The Big C. She will play Giselle, a sexy, married, and uninhibited pilates instructor who enters into an unconventional relationship with Cathy’s (Laura Linney) brother Sean (John Benjamin Hickey). Her growing affection for Sean and her adventurous sense of romance fulfills and complicates his life in ways he never expected. Blanchard, repped by ICM and Red Letter Entertainment, was recently seen in Moneyball. She is currently appearing on Broadway in How To Succeed and next stars opposite Kristin Davis in the Lifetime movie Of Two Minds.

Arron Shiver and newcomer Meg Steedle have landed recurring roles on HBO’s prohibition-era mob drama Boardwalk Empire. Shiver will play Dean O’Banion, based on the real-life florist-gangster of Prohibition Chicago and Al Capone’s nemesis. Steedle will play Billy Kent, a Broadway actress, the ‘pony,’ the third girl from the left, the quirky one you find yourself watching when your eyes are supposed to be on the star. Billy is charming, funny but also capable of breaking your heart. Shiver, repped by Global Artists Agency and managers Eunice Lee and Tim Jordan, will next be seen in the pilot episode of A&E’s new drama series Longmire and in Gore Verbinski’s Lone Ranger. For Steedle, repped by Abrams and Principal Entertainment, this is only her second TV gig following a guest spot on Body Of Proof.